Intent to implement: New HTMLInputElement.autocomplete values

[Matthew N.]

Summary: I am implementing support for @autocomplete values other than
"off"/"on" for HTMLInputElement.autocomplete. This allows web developers
to indicate how UAs should autocomplete/auto-fill values in the fields
(if they choose to do so) so they don't have to use heuristics to guess
what data is expected.
Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1009935
Link to standard:
http://www.whatwg.org/specs/web-apps/current-work/#attr-fe-autocomplete
Platform coverage: New values/tokens will be preffed on in the future
for platforms which make use of the associated values so that websites
can do feature detection.
Estimated or target release: The main consumer is requestAutocomplete[1]
although some of the values may be used by form manager and password
manager before that point.
Preference behind which this will be implemented:
dom.forms.autocomplete.experimental
We may use additional preferences or change the name once we know which
values we will initially support for requestAutocomplete and the
password manager.

FYI: The various attribute values have been in the web-apps spec for
over a year and Chrome is already making use of them for
requestAutocomplete and, I believe, inline form auto-fill.

[1]
https://groups.google.com/d/topic/mozilla.dev.platform/F2mMPBme40I/discussion

--
MattN